Great Tit Fat Reserves under Unpredictable Temperatures

We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weig...

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Veröffentlicht in:Journal of avian biology 1994-06, Vol.25 (2), p.156-160
Hauptverfasser: Bednekoff, Peter A., Biebach, Herbert, Krebs, John
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container_title Journal of avian biology
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creator Bednekoff, Peter A.
Biebach, Herbert
Krebs, John
description We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weights were higher during the period of unpredictable temperatures. At the end of the period with unpredictable temperatures, more weight was gained on cold than on warm days. During the unpredictable temperature treatment, birds defecated less while eating the same amount. Nightly weight loss depended upon evening weight level, but not upon overnight temperature. Our results suggest that Great Tits use daily temperatures to predict conditions for the following night and that they regulate overnight expenditures to match reserve levels.
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Psychology</topic><topic>Mathematical constants</topic><topic>Oxygen</topic><topic>Vertebrata</topic><topic>Weight gain</topic><topic>Weight loss</topic><topic>Wild birds</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bednekoff, Peter A.</creatorcontrib><creatorcontrib>Biebach, Herbert</creatorcontrib><creatorcontrib>Krebs, John</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Journal of avian biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bednekoff, Peter A.</au><au>Biebach, Herbert</au><au>Krebs, John</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Great Tit Fat Reserves under Unpredictable Temperatures</atitle><jtitle>Journal of avian biology</jtitle><date>1994-06-01</date><risdate>1994</risdate><volume>25</volume><issue>2</issue><spage>156</spage><epage>160</epage><pages>156-160</pages><issn>0908-8857</issn><eissn>1600-048X</eissn><abstract>We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. 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subjects Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Aves
Biological and medical sciences
Birds
Birds of prey
Ecology
Food
Food consumption
Fundamental and applied biological sciences. Psychology
Mathematical constants
Oxygen
Vertebrata
Weight gain
Weight loss
Wild birds
title Great Tit Fat Reserves under Unpredictable Temperatures
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